Automatic circuit-controller for electric motors.



S. SPARROW.

AUTOMATIC CIRCUIT CONTROLLER FOB ELECTRIC MOTORS. APPLICATION FILED 1m 21, 1909.

Patented 0011.24, 1911 2 SHEETS-SHEET 1.

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AUTOMATIC CIRCUIT CONTROLLER FOB ELECTRIC MOTORS.

' APPLIOATlON FILED HAY 271909 1,006,802. Patented 0015.24 1911 2 SHEETNSHBET 2 iilg I in WWW am g1 nvc 1 11b 1- Qfiwm w q pa/z :0: v

I. a 1 h/i o (IX/route 1 4.44 4 v 1 imi/(E, o JIMQ a UNITED STATES P TEnro'FFmn SIMON SPARROW, 015 ST. LOUIS, MISSOURI, ASSIGNOR TO WAGNER ELECTRIC MANUFACTURING COMPANY, OF MISSOURI.

s'r. LOUIS, MISSOURI, neonrgnnnonor nwo'mnc cmcm'r-con'rnonmn ron ELECTRIC morons.

Specification of Letters. Patent.

Patented Oct. {24, 191i.

Application filed May 27, 1909. SerialNo. 498,752:

To all whom it may concern: 1

Be it known that I, SIMON SPARROW, a citizen of the United States, 'residin" at the city of St. Louis, in the State of hfissouri, have invented a certain new and useful Automatic Circuit-Controller for Electric Motors, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it apper: tains to make and use the same, reference being had to the accompanying drawings, formi part of this specification. 7

My icntion relates to an automatic cireuit con roller for electric motors and more particularly to a centrifugal governing device for short-circuiting the individual coils of the armature after the motor has reached a predetermined speed. 7

One object of my invention is to rovide a device of the class named which W111 take up as little room as possible and another o ject of my invention is to so construct iii governor that the short-circuitin member? will be moved rapidly both to an from its? operative position no matter whether the m tor accelerates slowly or rapidly-1 1n 1 the accompanying drawings, which illustrate one form of circuit controlling fewith the commutator segments 15- coils of the armature 12 the commutator segments are made to project? beyond the core 16 of the commutator as is clearly shown in Fig. 1 of the drawings. ".An aperture is thus left within the commutatorse ments so that the various segments :ma y connected by means of the short-eirc'uitin ring. This shortircuitingringmay heo any usual form, hut- I refer to use one like thatshown in Fig. 1 0 the drawings and in detail in Fig. 6. This short-circulting de vice consists of the annular member 17 mounted upon the shaft 13 so as tobe capable of longitudinal movementgthereon. Mounted in the annular gnember 1.7 are a series ofcontact fingers 18 which are so arranged as to have a slight radial movement so that the centrifugal force generated by 76 the rotation of the armature will cause the said fingers to be forced firmly inticontact hen the to shortshort-circuiting ring is in position circuit said segments.

Situated at the end of the armature 12 opposite to the commutator '15 is a cup shaped member 20 in which are mounted the governor weights 21. The governor Wei hts 21 areprm ided withbearing sl'ots22 ig.

vice made in accordance with my invcntign, [-1) which take over pins 23 carried in the Figure 1 is a side elevation partly in section showing a motor to which my device 15 apseparate from the plied. Fig. .2 is a section through the 'arma ture and eommutaton of the motor; Fig. 3

Pia b is an end view of the governing device; 4 1s a detailed view of one of the governor weights; Fig. 5 is a view similar to Fig. 3

but showing weights removed; Fig. 6 is an enlarged section through, one side of the short cn-cmtmg'ring and Flg. 7 1s a sectional view of the cup shaped member in which the 1* inemhcrs integral 1 'the weights lie as nearly part 20. These pins 23 are necessarily made part 20 in order thgtilhey ma be properly machinedi They are eld in position by means of Usshaped s'pring B5 24 which hear upon their heads andare held in position by meansof nuts 25 on guide pins 26. These uide ins 26 engage with guiding slots 27 orme in the weights 21 and thus prevent lateral movement of the weights. The weights 21 are made \vingshaped and embrace the shaft lt'l as best shown in- Fig. 3 of the drawings. 7

The ends 28 of the weights 21 projeot heyond the cup shaped member 20 and are made heavier than the remaining part of the weights so that the centers of gyration of as is practicable in the axis of the shaft 13.

In order to communicate the movement of the weights 21 to the shortcircuiting ring 17 annular member 29 is provided within the cup 20. This annular member 29 is provided with teeth 30 which engage with 7 two parts and consequently notches 31 formed in the weights 21 as best shown in-Fig. 1 of the drawings. The engaging surfaces of the teeth 80 and notches 31 should be true odontoids so that the weights 21 will act substantially as pinion wheels and the ring 29 as a rack so that only rolling contact will be had between-the the frictiomwillbe reduced to a minimum. V

In order to communicate the movement of the ring 29 to the short-cireuiting ring 17 apair ofjrods se ta through openings in the armature 12 and commutator core 16 and are secured to thesaid short-circuiting ring 17 by means of nuts 33. The movement of the governor weights 20is opposed by 2 bar 29. A thread means of a coil spring 84 surrounding the shaft 13 and bearin upon the annular memmember" is provided by means of which the tension of the spring 34'may be regulated.

In my governing mechanism the governor weights are in unstable equilibrium in all positions between the open and closed poopposing said weights. 1

sitions and consequently the weights will only remain in the r open or closed position no matter what the speed of the armature. This is attained by so locatin the centers of gyration pf the overnor weights that the ratio of increase 0 the'radius ofgyration due. to the movement of the governor wei hts around their support is much greater t an the ratio of increase of stren h of the spring is not only insures the rapid movement of the short-circuiting member but also insures that the short-circuiting member will not be moved back into itsinitial position until the speed f rotating shaft, of a a surroundin of the armature has dropped considerably below that which is repaired to operate the device to short-circuit t e armature. In addition to this centrifugal weights are arranged around the shaft' in the smallest possible space and conse uently the other parts of the motor are not interfered with.

Having fully described my invention, what I claim as new and desire'to secure by Lettors Patent of the United States is:

1. In a governor, the combination with a rotating s aft, of a pair of win shaped Wrights surrounding said shaft an ivoted at the side thereof, and a longitudinaliy movable member provided with teeth arranged at the side of the shaft and engaging with said weights.

2. In a governor, the combination with a air of pivoted wei hts said s aft and having t eir eatest'welght at their ends, and a longitufinally movable member provided with a pair of teeth situated at the sides of the shaft and midway between' said weights, said teeth being enga d by said weights.

3. In a governor, t e combination with a said welghts.

shaped weights in said receptacle but having their ends projecting radially beyond the same, and a short circuiting device operated from said weights;

4. In a governor, the combination with a revolvin shaft, of a cup shaped receptacle snrroun 1n said shaft, a pair of wing shaped welghts pivoted in said receptacle but having their ends projecting radially beyond the same, and a lon 'tudinally movab e member located in sai -receptacle and provided with teeth engaging said weights.

5. In a governor, the combination with a revolving shaft, of a su port, removable pivot pins carried by sai support, retainin means for said pivot pms governor weights arranged to turn on said pins, and gui ing means acting directly on said weights to 'revent the lateral movement of said weig ts.

6. In a governor, the combination with a revolvin shaft, of a cup shaped rece tacle, removab e pivot pins in said receptac e, retaining means for said pivot pins, governor wei hts arranged to turn on said pins, and gui ing means acting directly on said sai weights.

7 In a governor, the combination with a revolving shaft, of a su port, removable pivot pins carried by said support, retaining means for said pivot pins, governor weights arranged to turn on said pivot pins, and guide pins at right angles to said pivot pins for preventing the lateral movement of 8. In a governor, the combination with a revolving shaft, of acup shaped receptacle, removable pivot pins in said receptacle, retaining means for said pivot pins, governor weights arranged to turn on said pins, and

ui e pins at ri ht angles to said pivot pins or preventing t e lateral movement of said weights.

9. In a governor, the combination with a revolving shaft, of a support, removable pivot pins carried by said support, governor weights arranged to turn on said pins, retainmg springs for holdin said pins in osition, guide pins for hol 'ng said weig ts in osition, and retaining means on said gui e pins engaging said springs.

10. In a overnor, the combination with a revolving s aft, of a cup shaped receptacle, removable 1pivot pins in said receptacle, governor weig ts arranged to turn'on said pins, retaining springs for holding said pins in position guide pins for holding'said weights in osition, and retaining means on said gui e ins engaging said sprin a 11. n a overnor, th combination with a revolving s aft, of em; Shaped receptacle weights to prevent the lateral movement of removable pivot pins in said receptacle, g ov- In testimony whereof I have hereunto set emor'weights arranged to turn on said pins, my hand and efiixed my seal in the presence U-shaped retaining springs .for holding said of the two subscribing witnesses.

pins in 'position, guide P1118 at right angles SIMON SPARROW. [1 5.] 5 to said pivot pins for holding said weights Witnesses: V

"in position, and nuts on seid guide pins en- .0. B. BENNm'r,

' gaging Said p M. L. FRANKLIN. 

